Tempered glass protective film for ultrasonic fingerprint recognition and preparation method thereof

Abstract

Disclosed are a tempered glass protective film for ultrasonic fingerprint recognition and a preparation method thereof. The tempered glass protective film comprises: a main film region (1) made of a tempered glass material, and a waveguide region (2) made of an ultrasonic high permeability material. The preparation method comprises the following steps: respectively preparing a tempered glass sheet and a waveguide sheet; opening a through hole on the tempered glass sheet; and fixing the waveguide sheet in the through hole on the tempered glass sheet to form a flat tempered glass protective film. Since the waveguide region is disposed, the ultrasonic wave is transmitted between the ultrasonic fingerprint sensor and the finger through the waveguide region, so that the echo energy received by the ultrasonic fingerprint sensor can be increased effectively, thereby enabling the ultrasonic fingerprint sensor to obtain a clear fingerprint image.

What is claimed is: 
     
         1 . A tempered glass protective film for ultrasonic fingerprint recognition, comprising:
 a main film region ( 1 ) made of a tempered glass; and   a waveguide region ( 2 ) made of an ultrasonic high permeability material.   
     
     
         2 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the waveguide region is correspondingly arranged according to different ultrasonic positions of an electronic device. 
     
     
         3 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the main film region surrounds the waveguide region. 
     
     
         4 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the waveguide region is located at one edge of the tempered glass protective film. 
     
     
         5 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the waveguide region is rectangular, elliptical or circular, and the size of the waveguide region matches the size of the fingerprint region of finger. 
     
     
         6 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the ultrasonic high permeability material constituting the waveguide region is an organic glass, an epoxy resin or a transparent plastic. 
     
     
         7 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 6 , wherein the ultrasonic high permeability material contains a photocurable component. 
     
     
         8 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 7 , wherein the photocurable component is UV glue. 
     
     
         9 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein an adhesive layer is provided on the same side of the waveguide region and the main film region. 
     
     
         10 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 9 , wherein the adhesive of the adhesive layer comprises AB glue. 
     
     
         11 . The tempered glass protective film for ultrasonic fingerprint recognition according to  claim 1 , wherein the main film region ( 1 ) comprises:
 a first light-transmitting hole ( 3 ) corresponding to a camera;   a second light-transmitting hole ( 5 ) corresponding to an optical sensor; and/or   a sound-transmitting hole ( 4 ) corresponding to an earpiece.   
     
     
         12 . A preparation method of a tempered glass protective film for ultrasonic fingerprint recognition,
 wherein the tempered glass protective film comprises a main film region ( 1 ) made of a tempered glass material and a waveguide region ( 2 ) made of an ultrasonic high permeability material;   wherein the preparation method comprises the following steps:   respectively preparing a tempered glass sheet and a waveguide sheet;   opening a through hole on the tempered glass sheet; and   fixing the waveguide sheet in the through hole on the tempered glass sheet to form a flat tempered glass protective film.   
     
     
         13 . A preparation method of a tempered glass protective film for ultrasonic fingerprint recognition,
 wherein the tempered glass protective film comprises a main film region ( 1 ) made of a tempered glass material and a waveguide region ( 2 ) made of an ultrasonic high permeability material;   wherein the preparation method comprises the following steps:   preparing a tempered glass sheet;   opening a through hole on the tempered glass sheet; and   injecting an ultrasonic high permeability material into the through hole, and forming the waveguide region through leveling, hot pressing, and natural drying.